package com.alinesno.cloud.base.workflow.rest;

import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import org.flowable.bpmn.model.BpmnModel;
import org.flowable.engine.ProcessEngine;
import org.flowable.engine.ProcessEngineConfiguration;
import org.flowable.engine.RepositoryService;
import org.flowable.engine.RuntimeService;
import org.flowable.engine.TaskService;
import org.flowable.engine.runtime.Execution;
import org.flowable.engine.runtime.ProcessInstance;
import org.flowable.image.ProcessDiagramGenerator;
import org.flowable.task.api.Task;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping(value = "expense")
public class ExpenseRestController {

	@Autowired
	private RuntimeService runtimeService;

	@Autowired
	private TaskService taskService;

	@Autowired
	private RepositoryService repositoryService;

	@Autowired
	private ProcessEngine processEngine;


	/**
	 * 添加报销
	 *
	 * @param userId    用户Id
	 * @param money     报销金额
	 * @param descption 描述
	 */
	@RequestMapping(value = "add")
	@ResponseBody
	public String addExpense(String userId, Integer money, String descption) {
		// 启动流程
		HashMap<String, Object> map = new HashMap<>();
		map.put("taskUser", userId);
		map.put("money", money);
		ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("Expense", map);
		return "提交成功.流程Id为：" + processInstance.getId();
	}

	/**
	 * 获取审批管理列表
	 */
	@RequestMapping(value = "/list")
	@ResponseBody
	public Object list(String userId) {
		List<Task> tasks = taskService.createTaskQuery().taskAssignee(userId).orderByTaskCreateTime().desc().list();
		for (Task task : tasks) {
			System.out.println(task.toString());
		}
		return tasks.toArray().toString();
	}

	/**
	 * 批准
	 *
	 * @param taskId 任务ID
	 */
	@RequestMapping(value = "apply")
	@ResponseBody
	public String apply(String taskId) {
		Task task = taskService.createTaskQuery().taskId(taskId).singleResult();
		if (task == null) {
			throw new RuntimeException("流程不存在");
		}
		// 通过审核
		HashMap<String, Object> map = new HashMap<>();
		map.put("outcome", "通过");
		taskService.complete(taskId, map);
		return "processed ok!";
	}

	/**
	 * 拒绝
	 */
	@ResponseBody
	@RequestMapping(value = "reject")
	public String reject(String taskId) {
		HashMap<String, Object> map = new HashMap<>();
		map.put("outcome", "驳回");
		taskService.complete(taskId, map);
		return "reject";
	}
	
	/**
     * 生成流程图
     *
     * @param processId 任务ID
     */
    @RequestMapping(value = "processDiagram")
    public void genProcessDiagram(HttpServletResponse httpServletResponse, String processId) throws Exception {
        ProcessInstance pi = runtimeService.createProcessInstanceQuery().processInstanceId(processId).singleResult();

        //流程走完的不显示图
        if (pi == null) {
            return;
        }
        Task task = taskService.createTaskQuery().processInstanceId(pi.getId()).singleResult();
        //使用流程实例ID，查询正在执行的执行对象表，返回流程实例对象
        String InstanceId = task.getProcessInstanceId();
        List<Execution> executions = runtimeService
                .createExecutionQuery()
                .processInstanceId(InstanceId)
                .list();

        //得到正在执行的Activity的Id
        List<String> activityIds = new ArrayList<>();
        List<String> flows = new ArrayList<>();
        for (Execution exe : executions) {
            List<String> ids = runtimeService.getActiveActivityIds(exe.getId());
            activityIds.addAll(ids);
        }

        //获取流程图
        BpmnModel bpmnModel = repositoryService.getBpmnModel(pi.getProcessDefinitionId());
        ProcessEngineConfiguration engconf = processEngine.getProcessEngineConfiguration();
        ProcessDiagramGenerator diagramGenerator = engconf.getProcessDiagramGenerator();
        InputStream in = diagramGenerator.generateDiagram(bpmnModel, "png", activityIds, flows, engconf.getActivityFontName(), engconf.getLabelFontName(), engconf.getAnnotationFontName(), engconf.getClassLoader(), 1.0, false);
        OutputStream out = null;
        byte[] buf = new byte[1024];
        int legth = 0;
        try {
            out = httpServletResponse.getOutputStream();
            while ((legth = in.read(buf)) != -1) {
                out.write(buf, 0, legth);
            }
        } finally {
            if (in != null) {
                in.close();
            }
            if (out != null) {
                out.close();
            }
        }
    } 
}